From: Jason Wang <jasowang@redhat.com>
To: Christoph Hellwig <hch@lst.de>
Cc: axboe@kernel.dk, mst@redhat.com, linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
linux-block@vger.kernel.org, pbonzini@redhat.com
Subject: Re: [PATCH 2/9] virtio_pci: use shared interrupts for virtqueues
Date: Fri, 3 Feb 2017 17:47:41 +0800 [thread overview]
Message-ID: <12332f9d-2cf8-d761-032e-a5a89863fd09@redhat.com> (raw)
In-Reply-To: <20170203082606.GB26800@lst.de>
On 2017年02月03日 16:26, Christoph Hellwig wrote:
> On Fri, Feb 03, 2017 at 03:54:54PM +0800, Jason Wang wrote:
>> On 2017年01月27日 16:16, Christoph Hellwig wrote:
>>> + snprintf(vp_dev->msix_names[i + 1],
>>> + sizeof(*vp_dev->msix_names), "%s-%s",
>>> dev_name(&vp_dev->vdev.dev), names[i]);
>>> err = request_irq(pci_irq_vector(vp_dev->pci_dev, msix_vec),
>>> - vring_interrupt, 0,
>>> - vp_dev->msix_names[msix_vec],
>>> - vqs[i]);
>>> + vring_interrupt, IRQF_SHARED,
>>> + vp_dev->msix_names[i + 1], vqs[i]);
>> Do we need to check per_vq_vectors before dereferencing msix_names[i + 1] ?
> No, we need to allocate the array larger in that case as want proper
> names for the interrupts.
Consider the case of !per_vq_vectors, the size of msix_names is 2, but
snprintf can do out of bound accessing here. (We name the msix shared by
virtqueues with something like "%s-virtqueues" before the patch).
Thanks
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next prev parent reply other threads:[~2017-02-03 9:47 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-27 8:16 automatic IRQ affinity for virtio V2 Christoph Hellwig
2017-01-27 8:16 ` [PATCH 1/9] virtio_pci: remove struct virtio_pci_vq_info Christoph Hellwig
2017-02-03 7:54 ` Jason Wang
[not found] ` <a5568074-d92e-8322-6955-19c640006fda@redhat.com>
2017-02-03 8:22 ` Christoph Hellwig
2017-01-27 8:16 ` [PATCH 2/9] virtio_pci: use shared interrupts for virtqueues Christoph Hellwig
2017-02-03 7:54 ` Jason Wang
[not found] ` <da34883b-1069-2cfc-aaa3-6aaf3ee0ebf2@redhat.com>
2017-02-03 8:26 ` Christoph Hellwig
2017-02-03 9:47 ` Jason Wang [this message]
2017-02-03 9:52 ` Christoph Hellwig
2017-02-03 9:56 ` Jason Wang
2017-01-27 8:16 ` [PATCH 3/9] virtio_pci: don't duplicate the msix_enable flag in struct pci_dev Christoph Hellwig
2017-02-03 7:56 ` Jason Wang
2017-01-27 8:16 ` [PATCH 4/9] virtio_pci: simplify MSI-X setup Christoph Hellwig
2017-02-03 7:57 ` Jason Wang
2017-01-27 8:16 ` [PATCH 5/9] virtio: allow drivers to request IRQ affinity when creating VQs Christoph Hellwig
2017-02-03 8:01 ` Jason Wang
2017-01-27 8:16 ` [PATCH 6/9] virtio: provide a method to get the IRQ affinity mask for a virtqueue Christoph Hellwig
2017-02-03 8:02 ` Jason Wang
2017-01-27 8:16 ` [PATCH 7/9] blk-mq: provide a default queue mapping for virtio device Christoph Hellwig
2017-01-27 8:16 ` [PATCH 8/9] virtio_blk: use virtio IRQ affinity Christoph Hellwig
2017-01-27 8:16 ` [PATCH 9/9] virtio_scsi: " Christoph Hellwig
[not found] <20170205171526.6224-1-hch@lst.de>
2017-02-05 17:15 ` [PATCH 2/9] virtio_pci: use shared interrupts for virtqueues Christoph Hellwig
2017-02-07 7:17 ` Jason Wang
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